docs: def renew(cls, fqdn, duration, background):
          """Renew a domain."""
          fqdn = fqdn.lower()
          if not background and not cls.intty():
              background = True
  
          domain_info = cls.info(fqdn)
  
          current_year = domain_info['date_registry_end'].year
          domain_params = {
              'duration': duration,
              'current_year': current_year,
          }
  
          result = cls.call('domain.renew', fqdn, domain_params)
          if background:
              return result
  
          # interactive mode, run a progress bar
          cls.echo('Renewing your domain.')
          cls.display_progress(result)
          cls.echo('Your domain %s has been renewed.' % fqdn)